Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a12349aeb3f8d87531ff2f4349a7f995e625cd2421d64675ff5e7ae0f99c74' 
  AND token = 'GVhRLLx+F4sNLVsGBiCxs8OOSxtEFe80sLxA7u3Hc64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}